diff --git a/runtime/indent/dosbatch.vim b/runtime/indent/dosbatch.vim
index aea2a18..d24b139 100644
--- a/runtime/indent/dosbatch.vim
+++ b/runtime/indent/dosbatch.vim
@@ -2,7 +2,7 @@
 " Language:	MSDOS batch file (with NT command extensions)
 " Maintainer:	Ken Takata
 " URL:		https://github.com/k-takata/vim-dosbatch-indent
-" Last Change:	2017 May 10
+" Last Change:	2021-10-18
 " Filenames:	*.bat
 " License:	VIM License
 
@@ -17,6 +17,8 @@
 setlocal indentkeys=!^F,o,O
 setlocal indentkeys+=0=)
 
+let b:undo_indent = "setl ai< inde< indk< si<"
+
 if exists("*GetDosBatchIndent")
   finish
 endif
diff --git a/runtime/indent/nsis.vim b/runtime/indent/nsis.vim
index 223f4fa..5d3decc 100644
--- a/runtime/indent/nsis.vim
+++ b/runtime/indent/nsis.vim
@@ -2,7 +2,7 @@
 " Language:		NSIS script
 " Maintainer:		Ken Takata
 " URL:			https://github.com/k-takata/vim-nsis
-" Last Change:		2018-01-21
+" Last Change:		2021-10-18
 " Filenames:		*.nsi
 " License:		VIM License
 
@@ -17,6 +17,8 @@
 setlocal indentkeys=!^F,o,O
 setlocal indentkeys+==~${Else,=~${EndIf,=~${EndUnless,=~${AndIf,=~${AndUnless,=~${OrIf,=~${OrUnless,=~${Case,=~${Default,=~${EndSelect,=~${EndSwith,=~${Loop,=~${Next,=~${MementoSectionEnd,=~FunctionEnd,=~SectionEnd,=~SectionGroupEnd,=~PageExEnd,0=~!macroend,0=~!if,0=~!else,0=~!endif
 
+let b:undo_indent = "setl ai< inde< indk< si<"
+
 if exists("*GetNsisIndent")
   finish
 endif
diff --git a/runtime/indent/teraterm.vim b/runtime/indent/teraterm.vim
index 35d7354..181c9a3 100644
--- a/runtime/indent/teraterm.vim
+++ b/runtime/indent/teraterm.vim
@@ -3,7 +3,7 @@
 "		Based on Tera Term Version 4.100
 " Maintainer:	Ken Takata
 " URL:		https://github.com/k-takata/vim-teraterm
-" Last Change:	2018-08-31
+" Last Change:	2021-10-18
 " Filenames:	*.ttl
 " License:	VIM License
 
@@ -18,6 +18,8 @@
 setlocal indentkeys=!^F,o,O,e
 setlocal indentkeys+==elseif,=endif,=loop,=next,=enduntil,=endwhile
 
+let b:undo_indent = "setl ai< inde< indk< si<"
+
 if exists("*GetTeraTermIndent")
   finish
 endif